(a) A 0.87 kg book is held stationary in the hand. Find the forces acting on the

Question

(a) A 0.87 kg book is held stationary in the hand. Find the forces acting on the book and the reaction forces to each of these.

(b) The hand now exerts an upward force of 16.5 N on the book. Find the book's acceleration.

A: _______ ; Upward/downward/There is no force?

(c) As the book moves upward, the hand is quickly removed from the book. Find the forces on the book and its acceleration.

1.Fhand on book = ____ ;upward/downward/There is no force? 2.Fbook on hand = ______ ;upward/downward/There is no force? 3.F(gravity) earth on book = _________ ; upward /downward /There is no force? 4.F(gravity) book on earth = __________ ; upward/downward/There is no force?

Explanation / Answer

a

1.mg = 0.87*9.8 = 8.5 N upward ( reaction force)

2. 8.5 N downward ( weight)

3. 8.5 N downward

4.8.5 N ,upward

b.(16.5-8.5)/0.87

a = 8/0.87 = 9.19m/S2

c.

1.no contact so 0 N

2. 0

3. 8.5N , downward

4. 8.5 N , upward

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